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Lots 495 - 498,
Catalogue of Stamp Auction #79, September 14, 2018. Raritan Stamps, Inc

Lot   Cat.#
Net Price
1991, Endangered Species, 1000r multicolored, complete set of six plate proofs with control angles at corners, printed on thick glazed paper, cut from composite proof sheetlet of six, each one with black overprint "Prueba"(Proof) on reverse, no gum as produced, NH, VF and very rare, reportedly only 45 sets were sold, the only uncut sheet retained in the Mexican Postal Museum
496  Sanabria #14

Air Post stamps

1929, Eagle, imperforated proof of 25c in green and brown, horizontal pair, nice four-side margins, full OG, hinged, VF and scarce, only 50 stamps were produced, C.v. $600 (1966)
497  C141
1944, Symbol of Flight, set of three essays of not approved design for 50c in various color combinations, all are in blocks of four with perfin "Muestra" (Specimen), full OG, NH, VF
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498  O193a

Official stamps

1927, inverted black overprint "Oficial" on Post Office 5p green and black, full OG, previously hinged, VF, MEPSI certificate, the stamp is listed, but has no price in Scott Cat.